Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b5318a2f304d1a…

MALICIOUS

PDF

84.1 KB Created: 2021-07-28 06:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a796bfec139ac4b929bf006f9bf0904e SHA-1: e9751d6110f571425acc59de5b7678432e96b6a5 SHA-256: f9b5318a2f304d1a79c5d6373599d72de2a72b359f86d7f627296cb25a21519b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/01a6c2a06eb6c663ab05c4450832d30d/zarofipewof.pdf In PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/45231479629.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1hqbul8799ojaoksmkla172kq4/buneje.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/iru9ngkmstbritvm36tjcb52lc/92027458535.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160917a6b7eb28---14287957359.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/20195602473.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071864b5f3e0---rirofodalaxomiji.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/dibura.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160832a0f62f1b---91810949719.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/d3nvu0ln9t58ngd8dcb9l89cgq/pikefubijilegujire.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c044447d984---kapaxutirawuboribilal.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/darawowogexu.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/nuselumaburugejupijebo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/53639144057.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/nesikaj.pdfIn PDF document text
    • http://com123.vn/uploads/file/72785343786.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/joxirelewuger.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021062019263118.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/belewuwarinezikevuxuruk.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8fabc546baed1e1760a8821518b4adaf/menudi.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/23429577580.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095113b9a183---rijetisirefemufa.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/71095955277.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0e73def68ba4393d74bca25a9d0e555/73728482110.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4d73e05de30fe571ddd6643cd04c8642/fulasuwapeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=castaway+on+the+moon+mp4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 18828 bytes
SHA-256: c6f6399da7afd032bdb0b14efa5c57fa9410aaac57eb0a832cfb7f6587bfe9b5
font_01_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 10588 bytes
SHA-256: 1de442877d18c8cad930663c129075b7c4dd6e0adf59ed247b0119c8e16b09cc
font_02_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1